removing a child node

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i want to remove from an xml its most inner child,under 1 o the xml cilds,
which maybe not the only 1 in the inner depth.
for example :

<GameType Ref="2">
 <Category id="23" isActive="1" Name="ca2111" innerOrder="448">
  <Game CategoryGameID="13" GameRef="12" isActive="1" innerOrder="34" 
GameName="Game1" GamePath="flash/Games/2_1357.swf" 
IconPathName="images/gamezone/temp.jpg" class="blue" title="game1 descr" 
FramePathName="images/gamezone/contBoxBlue24.png" /> 
  <Game CategoryGameID="14" GameRef="13" isActive="0" innerOrder="35" 
GameName="Game2" GamePath="flash/Games/121212_1357.swf" 
IconPathName="images/gamezone/temp.jpg" class="blue" title="dfgd fg dfg" 
FramePathName="images/gamezone/contBoxBlue24.png" /> 
  </Category>
  <Category id="27" isActive="0" Name="paint12" innerOrder="7" /> 
  </GameType>

and i want to delete where CategoryGameID="14".
itreid to do :

 XmlDocument.Load(filePath)
        If Not XmlDocument.SelectNodes("GamesZone/GameType[@Ref='" & 
GameTypeRef & "']/Category[@id='" & txtCategoryRef.Value & 
"']/Game[@CategoryGameID='" & CategoryGameID & "']") Is Nothing Then
            Dim Element2Delete As System.Xml.XmlElement = 
XmlDocument.SelectSingleNode("GamesZone/GameType[@Ref='" & GameTypeRef & 
"']/Category[@id='" & txtCategoryRef.Value & "']/Game[@CategoryGameID='" & 
CategoryGameID & "']")
            XmlDocument.RemoveChild(Element2Delete)
            XmlDocument.Save(filePath)
        End If

and i got an error
what am i doing wrong?
thnaks in advance
peleg